Article
Optics
A. D. Garcia-Orozco, L. Madeira, M. A. Moreno-Armijos, A. R. Fritsch, P. E. S. Tavares, P. C. M. Castilho, A. Cidrim, G. Roati, V. S. Bagnato
Summary: We studied the emergence of universal scaling in the time-evolving momentum distribution of a harmonically trapped three-dimensional Bose-Einstein condensate, which was parametrically driven to a turbulent state. We found that the out-of-equilibrium dynamics post excitation can be described by a single function due to nearby nonthermal fixed points. The observed behavior connects the dynamics of a quantum turbulent state to several far-from-equilibrium phenomena.
Article
Multidisciplinary Sciences
Mengjie Wei, Wouter Verstraelen, Konstantinos Orfanakis, Arvydas Ruseckas, Timothy C. H. Liew, Ifor D. W. Samuel, Graham A. Turnbull, Hamid Ohadi
Summary: The authors demonstrate the on-the-fly reconfigurable optical trapping of organic polariton condensates, which are delocalized over a macroscopic distance from the excitation region. This study holds great potential for future research on polaritonic lattice physics.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Yaojun Ying, Lizhen Sun, Haibin Li
Summary: The dynamics of Bose-Einstein condensates (BECs) in a single-well potential are investigated using the mode-coupling method. It is found that symmetry plays a crucial role in the coupling between modes. A proper mode-coupling theory of BECs in a single-well potential should include at least four modes. The mode dynamics of non-ideal BECs with interaction exhibit rich behavior, with the combination of nonlinear coupling and initial condition leading to different regimes of mode dynamics.
Article
Mathematics, Applied
Zhaopin Chen, Yongyao Li, Yan Liu, Boris A. Malomed
Summary: By using numerical methods, it is found that symmetric two-layer solitons in a double-layer system undergo a spontaneous-symmetry-breaking (SSB) bifurcation, producing families of asymmetric 2D solitons. The collapse occurs when the soliton's norm exceeds the norm of the Townes solitons. The SSB instability leads to dynamical symmetry breaking and spontaneous drift in the solitons.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Optics
J. Smits, H. T. C. Stoof, P. van der Straten
Summary: This study presents the observation and analysis of a spontaneously broken discrete time-translation symmetry in a driven system, showing a 50-50 split between two stable and temporal-distinct solutions. The experiment allows for further exploration of symmetry breaking in the discrete time crystal and for engineering excitations in space and time in the quantum domain.
Article
Physics, Multidisciplinary
S. Baryshev, A. Zasedatelev, H. Sigurdsson, I Gnusov, J. D. Topfer, A. Askitopoulos, P. G. Lagoudakis
Summary: In this study, we conducted full polarization tomography on photon correlations in a spinor exciton-polariton condensate. Our measurements demonstrate the different forms of condensate pseudospin mean-field dynamics and their intrinsic relation to the condensate photon statistics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Tuguldur Kh Begzjav, Duger Ulam-Orgikh
Summary: In this work, the theory for spin-1 Bose-Einstein condensate (BEC) based on SU(3) Lie group is developed, and it is predicted that any spin-1 atom can exist in either of two inequivalent fundamental representations of SU(3). The ground state of the spin-1 BEC can be either ferromagnetic or antiferromagnetic depending on the sign of a (1,1) - a (0,0), and the coherent spin mixing process is due to collisions between atoms in specific representations.
Article
Multidisciplinary Sciences
Silvana Palacios Alvarez, Pau Gomez, Simon Coop, Roberto Zamora-Zamora, Chiara Mazzinghi, Morgan W. Mitchell
Summary: We present a magnetic sensor with extremely high energy resolution, applied in the detection of Rb-87 single-domain spinor Bose-Einstein condensates. By utilizing nondestructive Faraday rotation probing, we have achieved a low-frequency magnetic sensitivity of 72(8) fT, and measured the volume, spin coherence time, and readout noise of the condensate experimentally.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Mathematics, Interdisciplinary Applications
Mikhail N. Smolyakov
Summary: In this paper, quantization of a weakly nonideal Bose gas at zero temperature is performed along the lines of the well-known Bogolyubov approach. By introducing nonoscillation modes and calculating nonlinear corrections, the analysis successfully recovers canonical commutation relations and solves the issue of nonconserved particle number at least in the case of free quasi-particles.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Optics
M. Miskeen Khan, H. Tercas, J. T. Mendonca, J. Wehr, C. Charalambous, M. Lewenstein, M. A. Garcia-March
Summary: The study investigates the quantum motion of an impurity atom in a Bose-Einstein condensate in arbitrary dimensions, showing superdiffusive behavior, dimension-dependent average energy, and non-Markovianity of particle motion. Trapped impurity atoms exhibit stronger position squeezing in lower dimensions.
Article
Optics
Yuhang Nie, Jun-Hui Zheng, Tao Yang
Summary: In this article, we investigate the Bogoliubov excitation spectrum of quantum droplets in an optical lattice and classify the collective excitations into different modes. The oscillation frequencies and phononic modes of the droplets are measured through experimental measurements. Furthermore, the instability caused by density fluctuations and the critical filling of atoms are discussed. This work is essential for understanding the superfluid nature of quantum droplets in an optical lattice.
Article
Optics
Boyao Li, Xingjie Wang, Yaoyao Liang, Jinghua Sun, Sufang Zhu, Xiaoyong Chen, Guiyao Zhou
Summary: This study reports the generation of vectorial solitons in a single cavity induced by dual-core fiber assisted ultrafast fiber lasers. It was found that four-component polarized rotation vector solitons (PRVS) are generated using the dispersive Fourier transformation technique. Furthermore, by controlling the soliton phase offset in dual-core fiber, the soliton rain state of multi pulse evolution can be obtained.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Mateus C. P. dos Santos, Wesley B. Cardoso
Summary: The paper analyzes the spontaneous symmetry breaking induced by a specific component in a linearly coupled binary Bose-Einstein condensate. Through numerical simulations, symmetric and asymmetric ground states are obtained, and induced asymmetry in the partner field is observed, demonstrating the influence of linear coupling on the balance between atomic species and the appearance of Josephson and SSB phases.
NONLINEAR DYNAMICS
(2023)
Article
Mathematics, Applied
Hidetsugu Sakaguchi, Boris A. Malomed
Summary: This study extends the theoretical treatment of spontaneous symmetry breaking in two-component systems to a system with competing linear coupling and repulsive interactions. It explores ground-state solutions, vortex states, and gap solitons in various conditions, showing that spontaneous symmetry breaking occurs when the cross-component repulsion is stronger than the self-repulsion. The symmetry breaking transition is categorized as a supercritical bifurcation, leading to broken symmetry states in the inner area and intact symmetry in the surrounding layer.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2021)
Article
Optics
Ralf Wanzenboeck, Stefan Donsa, Harald Hofstaetter, Othmar Koch, Peter Schlagheck, Iva Brezinova
Summary: The study investigates the chaos phenomenon in the mean-field limit of a bosonic quantum many-body system, demonstrating that the system rapidly loses coherence with a rate determined by the Lyapunov exponent, which in turn affects the visibility of interference fringes.
Article
Multidisciplinary Sciences
Xunda Jiang, Zhu Ma, Jun Xu, Chaohong Lee
Summary: This article investigates the critical dynamics associated with spontaneous symmetry breaking (SSB) phase transition and introduces two typical universal non-equilibrium dynamics in Bose condensed atomic gases. Through experiments and numerical simulations, the important role of the Kibble-Zurek mechanism in these phase transitions is revealed.
CHINESE SCIENCE BULLETIN-CHINESE
(2022)
Article
Multidisciplinary Sciences
Qingqing Cheng, Huaiqiang Wang, Yongguan Ke, Tao Chen, Ye Yu, Yuri S. Kivshar, Chaohong Lee, Yiming Pan
Summary: This study reveals an unexpected phenomenon in topological pumping observed in arrays of nonparaxial optical waveguides and demonstrates an asymmetric topological pumping process. This finding could open avenues for the development of nonparaxial topological photonics.
NATURE COMMUNICATIONS
(2022)
Article
Quantum Science & Technology
Hongtao Huo, Min Zhuang, Jiahao Huang, Chaohong Lee
Summary: This study proposes a method to concurrently generate entanglement and perform sensing within a limited coherence time, and finds the optimal control sequences through machine optimization. By optimizing the number of particles and time-modulated rotations along two different axes, Heisenberg-limited precision scaling can be achieved.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Tian Guo, Peiliang Liu, Chaohong Lee
Summary: The study successfully adjusted the radio frequency trapping ions using a newly designed helical resonator, improving measurement accuracy and reducing micromotion frequency shifts in the ion trapping system. Experimental results were in good agreement with the theoretical model.
Article
Quantum Science & Technology
Yuxiang Qiu, Min Zhuang, Jiahao Huang, Chaohong Lee
Summary: This paper presents a Bayesian phase estimation algorithm with an ingenious update rule of the auxiliary phase using entropy-based sampling. Unlike other adaptive algorithms, the auxiliary phase in this algorithm is determined only once in a pre-estimation step. By selecting informative data, the algorithm reduces the number of measurements required. The algorithm has promising applications in various practical quantum sensors.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Yuxiang Qiu, Min Zhuang, Jiahao Huang, Chaohong Lee
Summary: This study proposes a scheme to optimize the state preparation pulse sequence for accelerating entanglement generation using deep reinforcement learning. By maximizing the quantum Fisher information, the pulse sequence can generate entangled states with ultimate precision bounds following the Heisenberg-limited scalings, and show better robustness against differences between simulation and experiment.
NEW JOURNAL OF PHYSICS
(2022)
News Item
Physics, Multidisciplinary
Yongguan Ke, Chaohong Lee
Summary: Researchers discovered that the combination of many-body interactions and topology poses experimental challenges. They found that strong interparticle interactions can cause ultracold atoms to shift collectively or individually, leading to the breakdown of quantization in a topological pump.
Article
Materials Science, Multidisciplinary
Ling Lin, Yongguan Ke, Chaohong Lee
Summary: Beyond the well-known topological band theory for single-particle systems, it is a great challenge to characterize the topological nature of interacting multiparticle quantum systems. Here, we uncover the relationship between topological invariants defined through the twisted boundary condition (TBC) and the center-of-mass (c.m.) momentum state in multiparticle systems. Our work lays a concrete foundation and provides insights for exploring multiparticle topological states.
Article
Physics, Multidisciplinary
Wenjie Liu, Shi Hu, Li Zhang, Yongguan Ke, Chaohong Lee
Summary: This study explores how particle-particle interactions affect topological transport in a periodically modulated and tilted optical lattice. Three characterized interaction effects are revealed: topological pumping of bound states, interaction blockade of scattering states, and topologically resonant tunnelings. This research deepens the understanding of correlation effects on topological states and provides a feasible way for detecting topological properties in interacting systems.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Quantum Science & Technology
Min Zhuang, Jiahao Huang, Chaohong Lee
Summary: By employing a multi-mode many-body quantum interferometry, we can test the LSV parameter with ultimate precision and potentially surpass the standard quantum limit. This approach opens up a feasible way for significant improvement in LSV tests with atomic systems and highlights the potential of multi-particle entangled states in quantum measurements.
Article
Optics
X. N. Feng, Jiahao Huang, L. F. Wei, Chaohong Lee
Summary: In this study, a scheme is proposed to suppress spin dephasing in a spin-oscillator system by squeezing the quantum fluctuation of the two-mode oscillator. It is shown that squeezing either on a single mode individually or on both modes simultaneously can effectively suppress spin dephasing.
Article
Physics, Multidisciplinary
Zhoutao Lei, Yuangang Deng, Chaohong Lee
Summary: This study explores the coexistence of a single unpaired triply degenerate point (TDP) and multiple twofold Weyl points (WPs) using an experimental scheme with ultracold pseudospin-1 atomic gases trapped in optical lattices. The results show that the unpaired TDP possesses a topological nontrivial middle band and is directly connected to additional WPs by topologically protected Fermi-arc states.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Jiahao Huang, Hongtao Huo, Min Zhuang, Chaohong Lee
Summary: This article proposes a scheme to generate spin cat states using machine optimization, which relies only on experimentally demonstrated interactions and time modulation of rotations designed via machine optimization. Compared to adiabatic evolution, the proposed scheme has a significantly shorter evolution time and requires less modification to existing experimental setups. It is efficient and easy to implement in state-of-the-art experiments.
Article
Quantum Science & Technology
Min Zhuang, Jiahao Huang, Chaohong Lee
Summary: The study introduces a new approach for achieving high-precision detection of time-dependent signals using many-body quantum systems. The many-body quantum lock-in amplifier extracts frequency and amplitude of unknown alternating field by applying a multi-pulse sequence, with measurement signal at the lock-in point being independent of the interrogation time.
Article
Optics
Xunda Jiang, Bo Lu, Chengyin Han, Ruihuan Fang, Minhua Zhao, Zhu Ma, Tian Guo, Chaohong Lee
Summary: In this study, we investigated the universal nonequilibrium dynamics of the superradiant phase transition in the anisotropic quantum Rabi model. By introducing position and momentum operators, we diagonalized the Hamiltonian, obtained the ground states and their excitation gaps, and numerically extracted critical exponents that were consistent with analytical results. This provides a dynamic approach to explore universal critical behaviors in the anisotropic quantum Rabi model.
